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# Title: Qua Continentur De Angulo Contactus & Semicirculi, Disquisitio Geometrica. De Sectionibus Conicis Tractatus. Arithmetica Infinitorum: sive de Curvilineorum quadraturâ, &c. Eclipseos Solaris Observatio (shelfmark Leibn. Marg. 84:2)
# Folio 25, page id 824573315:0109
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PROP. 10S
DeSectionibus Conicis.
P R O P. X.
De Conoiders es Pyramidoideos Parabolici sectione.
Y Pyramidoides (vel Conoides) Porabolicum
plano per axem secetur; cum manifectum sE
iplus intinita plana similia similiter sccari, 
quidem per centra; crunt ca Cur iliter bilecta; acque
communes corum cum plano lecance scctiones crunt
proxterca in hgurarum luarum, (quae quidem Arith.
metice proportionales lunc) adcog; e dictantiarum a
vertice, lubduplicata ratione, e Propterea, ut or-
dinarim. applicarae in ParaboId Communis reitur sectio
(erramidoidis Parabolici, planique per axem secantis,
est Parabola.
De aliis vero Connidens Parabolici sectionibus (non per
axera) non libet hic Ip ciacim disserere: Sunt autem illae omnes
(vel circulis vel) E.lipses.
Nocacamen, uc ejuldem Parabolae infinirae lunt Diamerris
_c uo loco dicetur;) ita _ Conoideos Parabolici infinieos esse (II-
De Diametros dicas, F.ve) Axes; qui quidem omnes Cue Parabola
rum Diameeri) sumsinvicem paralleli: Dui omnes sua plana habent
Ordinarim applicata.
Verum